共查询到19条相似文献,搜索用时 187 毫秒
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本文研究了用常规粉末冶金工艺制备颗粒增强铜基热沉复合材料的机械物理性能。研究结果表明 :采用W和Al2 O3颗粒增强铜基热沉复合材料 ,可以有效地改善烧结铜材料的硬度和抗拉强度 ,提高抗高温回复性能 ;W颗粒增强铜基热沉复合材料比Al2 O3颗粒增强铜基热沉复合材料的热导率要高 相似文献
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不同陶瓷颗粒增强Cu基复合材料的制备及导电性能 总被引:1,自引:0,他引:1
以纯铜为基体,以WC、AlN、TiN、MgB2等具有不同导电性能与密度的陶瓷颗粒为增强相,采用球磨-冷压-烧结工艺制备了WCp/Cu、AlNp/Cu、TiNp/Cu和MgB2p/Cu系列复合材料.研究了制备工艺的不同环节对铜基复合材料导电性能的影响,讨论了不同陶瓷颗粒增强铜基复合材料的导电性能.结果表明相同制备工艺及体积分数条件下,以具有不同导电性能与密度的陶瓷颗粒作为增强相的铜基复合材料的导电性能相近,球磨、冷压、烧结、复压及复烧等工艺环节对铜基复合材料导电性能有不同程度的影响,提高铜基复合材料的致密度为提高其导电性能的关键. 相似文献
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颗粒种类及制备工艺对铜基材料性能影响 总被引:5,自引:0,他引:5
以纯铜为基体,以WC、AlN、TiN、MgB2等具有不同导电性能与密度的陶瓷颗粒为增强相,采用粉末冶金工艺制备了WCp/Cu、AlNp/Cu、TiNp/Cu和MgB2p/Cu系列复合材料.研究了不同增强颗粒、制备工艺的不同环节对铜基复合材料导电性能的影响.结果表明:相同制备工艺及体积分数条件下,以具有不同导电性能与密度的陶瓷颗粒作为增强相的铜基复合材料的导电性能相近,混粉、压制、烧结、复压及复烧等工艺环节对铜基复合材料导电性能有不同程度的影响,提高铜基复合材料的致密度为提高其导电性能的关键. 相似文献
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颗粒增强铜基热沉复合材料的研制 总被引:5,自引:0,他引:5
本文研究了用常规粉末冶金工艺制备颗粒增强铜基热沉复合材料的机械物理性能,研究结果表明,采用W和Al2O3颗粒增强铜基热沉复合材料,可以有效地改善烧结铜材料的硬度和抗拉强度,提高抗高温回复性能;W颗粒增强铜基热沉复合材料比Al2O3颗粒增强铜基热沉复合材料的热导率要高。 相似文献
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纳米Cu-Al2O3复合材料的烧结法制备研究 总被引:3,自引:0,他引:3
研究了纳米Al2O3陶瓷颗粒增强铜基复合材料制备技术.选用纳米级Al2O3陶瓷颗粒作为增强相,采用超声波增强化学镀的方法完成对纳米Al2O3陶瓷颗粒金属铜包覆,热压烧结成纳米Al2O3陶瓷颗粒增强铜基复合材料,开采用XRD、TEM等分析测试技术对其组织性能进行研究. 相似文献
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铜基复合材料有望全面提升铜及铜合金的力学性能和导电、导热等功能特性。石墨烯具有优异的力学和物理性能,是铜基复合材料的理想增强相。石墨烯/铜界面的性质决定了复合材料性能,进行界面调控以提高石墨烯/铜的界面结合性已成为研究人员关注的热点问题。总结了近几年开发的石墨烯缺陷设计法、碳-碳杂化增强相法、金属和陶瓷纳米颗粒修饰石墨烯法以及原位生长石墨烯和石墨烯复合增强相法等多种界面调控策略,讨论了多种界面调控策略对石墨烯增强铜基复合材料的力学、导电、导热性能的作用机理,展望了应用界面调控策略研发的高性能复合材料的应用前景和未来研发的发展方向。 相似文献
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Meng-Jie Chang Wen-Na Cui Jun Liu Kang Wang Hui-Ling Du Lei Qiu Si-Meng Fan Zhen-Min Luo 《材料科学技术学报》2020,(1):97-105
TiO2/Bi4 Ti3 O12 hybrids have been widely prepared as promising photocatalysts for decomposing organic contaminations.However,the insufficient visible light absorption and low charge separation efficiency lead to their poor photocatalytic activity.Herein,a robust methodology to construct novel TiO2/Bi4 Ti3 O12/MoS2 core/shell structures as visible light photocatalysts is presented.Homogeneous bismuth oxyiodide(BiOI) nanoplates were immobilized on electrospun TiO2 nanofiber surface by successive ionic layer adsorption and reaction(SILAR) method.TiO2/Bi4 Ti3 O12 core/shell nanofibers were conveniently prepared by partial conversion of TiO2 to high crystallized Bi4 Ti3 O12 shells through a solid-state reaction with BiOI nanoplates,which is accompanied with certain transition of TiO2 from anatase to rutile phase.Afterwards,MoS2 nanosheets with several layers thick were uniform decorated on the TiO2/Bi4 TiO3 O12 fiber surface resulting in TiO2/Bi4 Ti3 O12/MoS2 structures.Significant enhancement of visible light absorption and photo-generated charge separation of TiO2/Bi4 Ti3 O12 were achieved by introduction of MoS2.As a result,the optimized TiO2/Bi4 Ti3 O12/MoS2-2 presents 60% improvement for photodegrading RhB after 120 min irradiation under visible light and 3 times higher of apparent reaction rate constant in compared with the TiO2/Bi4 Ti3 O12.This synthetic method can also be used to establish other photocatalysts simply at low cost,therefore,is suitable for practical applications. 相似文献
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《材料科学技术学报》2020,(3)
Textured Ti_2AlC lamellar composites have been successfully fabricated by a new method in the present work. The composites exhibit high compressive strength of ca 2 GPa, fracture toughness of 8.5 MPa m1/2(//c-axis), flexural strength of 735 MPa(//c-axis) and high hardness of 7.9 GPa(//c-axis). The strengthening mechanisms were discussed. The sintering and densification process was investigated and crystal orientation and microstructure were studied by electron backscattered diffraction techniques. The synthesis temperature is reduced to 1200?C by using high surface-to-volume ratio Ti_2AlC nano flakes. The Lotgering orientation factor of Ti_2 AlC and Ti_3 AlC_2{00 l} planes in the textured top surface reaches 0.74 and 0.49, respectively. This new route may shed light on resolving the difficulties encountered in large scale fabrication of textured MAX phases. 相似文献
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Xianlong Wang Jinchuan Jie Shichao Liu Zhuangzhuang Dong Guomao Yin Tingju Li 《材料科学技术学报》2021,61(2):138-146
In the present work, in-situ Ti5Si3 reinforced special brasses were prepared by melt reaction method. The synthesized Ti5Si3 phase shows various morphologies in brasses with different Ti5Si3 content, and the3 D morphological evolution of primary Ti5Si3and its growth mechanism were investigated. The Ti5Si3 crystal, which bears D88 hexagonal crystal structure, grows along <0001> direction and is revealed by{1010} faces during growth. With the increase of Ti5Si3 content in the brasses, the morphology of primary Ti5Si3significantly changes from fibers to hexagonal prisms to short-rods with hollow. In addition,the influence of Ti5Si3 volume fraction and morphology on the wear behavior of special brass was also revealed. It was substantiated that the wear resistance increases with the increasing volume fraction of Ti5Si3, and the corresponding wear mechanism changes from delamination to slight adhesive wear and abrasive wear. However, the friction coefficient shows an abnormal increase when most of the Ti5Si3 containing hollows appears in the brass. That is mainly due to the fact that the Ti5Si3 is easier to break and fall off resulted by the hollow as a crack source, which makes it unable to resist the plastic deformation of the contact surface during the sliding. 相似文献
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采用sol-gel法在Pt/Ti/SiO_2/Si衬底上制备Pb(Zr_(0.53)Ti_(0.47))O_3薄膜.利用X射线衍射仪(XRD)和原子力显微镜(AFM)对其晶格结构和微观形貌进行了表征,通过改变退火温度制得了具有单一钙钛矿结构的Pb(Zr_(0.53)Ti_(0.47))O_3薄膜.然后将该薄膜与环氧树脂形成复合结构材料.对其铁电性能以及复合材料的阻尼性能进行了测试,结果表明,退火温度的升高有利于改善薄膜的铁电性能,在750℃下退火的Pb(Zr_(0.53)Ti_(0.47))O_3薄膜,其剩余极化值2Pr达到了68.6μC/cm~2, 矫顽场强2E_c达到158.7kV/cm;同时退火温度的升高还有利于薄膜致密度的提高,对复合材料的阻尼性能也有一定的改善,当退火温度达到800℃,复合材料的阻尼损耗因子达到最大值,阻尼温域最宽,阻尼性能最好. 相似文献
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采用三点弯曲及扫描电镜等方法研究了SiCw/Al2O3、SiCw/ZrO3(Y2O3)及SiCw/Al2O3+ZrO2(Y2O3)陶瓷复合材料的抗热震性.结果表现SiCw的加入使Al2O3、ZrO2(Y2O3)以及Al2O3+ZrO2(Y2O3)基体的抗热震性显著提高,Al2O3陶瓷基复合材料的抗热震性明显优于ZrO2(Y2O3)陶瓷基复复合材料.同时发现在Al2O3十SiCw材料基础上再加入少量ZrO2(2Y)颗粒(10Vo1%),也可进一步提高Al2O3+SiCw材料的抗热震性. 相似文献